<template>
    <!-- Home组件-->
    <el-container class="home-container">
      <!-- 头部区域 -->
      <el-header >
        <div>
          <img src="../assets/heima.png" alt="">
          <span>电商后台管理系统</span>
        </div>
        <el-button type="info" @click="logout">退出</el-button>
      </el-header>
      <!-- 页面主体区域 -->
      <el-container>
        <!-- 侧边栏 -->
        <el-aside width="200px">
          <!-- 侧边栏菜单区域 -->
          <el-menu background-color="#333744" text-color="#fff"
          active-text-color="#409BFF" :unique-opened="true"
          :collapse-transition="true" :collapse="false"
          :router="true" :default-active='activePath'>
              <!-- 一级菜单:index只接受字符串 :default-active='activePath'-->
            <el-submenu :index="item.id + ''" v-for="item in menuList" :key="item.id">
              <!-- 一级菜单的模板区域 -->
              <template slot="title">
                <!-- 图标 -->
                <i  :class="iconList[item.id]"></i>
                <!-- 文本 -->
                <span>{{item.authName}}</span>
              </template>
              <!-- 二级菜单 -->
              <el-menu-item :index="'/' +subItem.path" v-for="subItem in item.children"
              :key="subItem.id" @click="saveNavState('/' +subItem.path)">
              <!--  -->
                <template slot="title">
                  <!-- 图标 -->
                  <i class="el-icon-menu"></i>
                  <!-- 文本 -->
                  <span>{{subItem.authName}}</span>
                </template>
              </el-menu-item>
            </el-submenu>
          </el-menu>

        </el-aside>
        <!-- 右侧内容主体 -->
        <el-main>
          <router-view></router-view>
        </el-main>
      </el-container>
    </el-container>
</template>

<script>

export default {
  data () {
    return {
      // 左侧菜单数据
      menuList: [],
      iconList: {
        125: 'iconfont icon-user',
        103: 'iconfont icon-tijikongjian',
        101: 'iconfont icon-shangpin',
        102: 'iconfont icon-danju',
        145: 'iconfont icon-baobiao'
      },
      // 是否折叠
      isCollapse: false,
      // 被激活的链接地址
      activePath: ''
    }
  },
  created () {
     // 在created阶段请求左侧菜单数据
    this.getMenuList()
    console.log(window.sessionStorage.getItem('activePath'))
    this.activePath = window.sessionStorage.getItem('activePath')
  },
  methods: {
    logout () {
      window.sessionStorage.clear()
      this.$router.push('/login')
    },
    // 获取所有的菜单
    async getMenuList () {
      // 发送请求获取左侧菜单数据
      const { data: res } = await this.$http.get('menus')
      // console.log(res)
      if (res.meta.status !== 200) return this.$message.error(res.meta.msg)
      this.menuList = res.data
    },
    // 点击按钮,切换菜单的折叠与展开
    toggleCollapse () {
      this.isCollapse = !this.isCollapse
    },
    // 保存链接的激活状态
    saveNavState (activePath) {
      console.log('**********' + activePath)
      window.sessionStorage.setItem('activePath', activePath)
    }
  }
}
</script>

<style lang="less" scoped>
.home-container {
    height: 100%;
}
.el-header{
  background-color: #373D41;
  display: flex;
  justify-content: space-between;
  padding-left: 0;
  align-items: center;
  color: #EAEDF1;
  font-size:20px;
  > div {
    display: flex;
    align-items: center;
    span{
      margin-left: 15px;
    }
  }
}

.el-aside{
  background-color: #333744;
  .el-menu{
    border-right: none
  }
}

.el-main {
  background-color: #EAEDF1;
}

.iconfont {
  margin-right: 10px;
}
</style>
